Trackway apparatus for automatic train-control systems



[km 30, 1930. G, w. BAUGHMAN 1,786,818

TRACKWAY APPARATUS FOR AUTOMATIC TRAIN CONTROL SYSTEMS Filed Nov. 28, 1928 3 Fain Control Ybrrz'torg q INVENTOR 7 u hrrmn, BY

M Q ATTORNE B Ziw'n 631252 0! Terrzkory c 3 5 TD Patented Dec 30, 1930 *unirso STATES PATENT OFFICE,

GEORGE W. BAUGHMAN, OF EDGEWOOID BOROUGH, PENNSYLVANIA, ASSIGNOR TO THE UNION S REI'I'ICH & fiIG-NAL COMPANY, OF S'WISSVALE, PENNSYLVANIA, A CORPORA- TION OF PENNSYLVANIA TRACKWAY APPARATUS FOR AUTOMATICTRAIN-CONTROL SYSTEMS Application filed November 28, 1928;

My invention relates to traclrway apparatus for an automatic train control system in which energy is at times supplied to the trackway for the control of apparatus car-' ried on a train.

I will describe two forms of trackway apparatus embodying my inventioinand will then point out the novel features thereof in claims.

in the accompanying drawing, Fig. 1 is a diagrammatic view illustrating one form of tracliway apparatus embodying my invention. F 2 is a view showing a modified form the apparatus and also embodying my invention.

Referring first to Fig. 1, the reference characters and l designate the track rails of a stretch of railway track over which traffic normally moves in the direction indicated by the arrow. These rails are divided, by means of insulated joints 2, to form a plurality of successive track sections A-B, BG, etc. Each track section is provided with a track circuit comprising a battery D connected nor the rails adjacent one end of the section, and a track relay designated by the reference character R with a distinguishing exponent connected across the rails adjacent tli site en d of the section.

v i B is territory by which I mean that the portion o 'heright of this point is provided s sn g verning means on the train in accordance with traffic conditions.

Traffic entering train control territory is governed by a tracllway signal designated by the reference character S and located adjacent point B. As here shown the signal S is a ight signal comprising two units and 51 illustrated in Fig. 1 3

' the code transmltter is'energized. When reat the entrance of train control ot shown in the drawing for anged when lighted to indicate stop or Serial N 0. 322,455.

nated in general by the reference character K and comprising an armature 4 which is arranged to be swung alternately into engagement with two-fixed contacts i and 4 when source of alternating current not shown in the drawing. hen a train enters section A-B,

therefore, and de-energizes relay R the code transmitter K is set into operation so that contacts 4-4 and l-el are operated alternately. Each time contact l-4 is closed, currentflows from terminal X, over front contact 4-4 of code transmitter K and primary 5 of a transformer T to terminal Y. The secondary 6 of transformer T is connected through prlmary 7 oftransformer G directly with the trackway loop L. It follows, therefore, that when the code transmitter is being operated, periodically interrupted current is supplied to the trackway loop L. The secondary 8 of transformer G is connected, through a rectifier J with the winding of a slow releasing relay P so that this relay holds its front contacts closed continuously when the code transmitter K is operated.

The code transmitter K also controls an auxiliary circuit including the primary 9 of a transformer H, it being noticed that each time contact 4 9? of the code transmitter is closed, that is, during the interruptions bewith the winding of a slow releasing relay P so that relay P holds its front contacts closed continuously when code transmitter K is being operated.

The signal S is controlled in part by relays P and-P so that when either of these relays is (lo-energized a circuit is completed from a source of energy such as battery Q, over back contact lei of relay P or back contact 15 of relay P and unit 50 of signal S back to battery When this circuit is closed, the signal S indicates stop. If, however, the code transmitter K is being operated, relays P and P are both energized as explained hereinbefore, and it relay R is energized current flows from battery Q, over front contact 11 of relay P front contact 12 of relay P front contact 13 of relay R unit 51 of signal S and back to battery Q. Under these conditions, unit 51 of signal S is lighted to indicate proceed. It relay R is de-encrgized when a train enters section A--B, the circuit justtraced for unit 51 of signal S is interrupted, and a circuit is then completed for unit 50 of signal S over frontcontacts of relays P and P and back contact 13 of relay R It follows, therefore, that signal S can indicate proceed. only if relay R is energized and relays P and P are both energized. It, therefore, the code transmitter fails to operate, or if the circuit for the trackway loop L is for any reason interrupted, one or both of'relays P and P will be de-energized and signal S will then indicate stop, independently of traffic conditions in advance, so that thejoperator of the train passing signal S will be informed. that the train carried portion of the train control system is not conditioned to place the train under the influence of the train control system.

Referring now to Fi 2, the signal S as here shown, is of the semaphore type and is controlled by a manually operable lever U which may be located at a point remote from the signal, as for example, in an interlocking cabin. Operativelyconnected with the lever U is a segment 37 which co-operates with a dog 38 controlled by a magnet M for zit-times controlling movements of the lever U. As shown in the drawing, the lever U occupies its normal position, and normal coi'itact- 19 closed. If the lever is moved in a clockwise direction toward its reverse position, contact 19 opens. The motion of the lever is arres Til. however, by co-operation of doc; 38 and ment 37 unless magnet M is energized. If magnet M energized to release the segment. 37, the lever U may be moved to its full rcverse position in which case reverse contact 40 is closed. As shown in the drawin the circuit for signal S is open, so that this 11:11 indicates stop. Furthermore, the code transmitter K is at rest so that relays P d P are both deenergized. A circuit is now closed, however, for an approach relay V which circuit may be traced from battery Q, over wires 18 and 13, normal contact 19 of lever U, wire 20, winding of relay lV, and wires 21, 23 and 2%, back to battery Q.

I will now assume that the operator wishes to clear signal S He first moves lever U away from its normal position, until the motion of the lever is arrested by the dog 38 and segment 37. In this position of lever U, the normal contact 19 is open, and the circuit for relay is therefore interrupted, so that this relay becomes deenergized. A circuit is then completed from terminal X, over back contact 25 of relay 1V, wires 26 and 27, and winding of transmitter K to terminal Y. The code transmitter is therefore set into operation and current flows from terminal X, over back contact 25 of relay W, wires 26, 28 and 29, and thence over contacts 4.l and 4-4" of code transmitter K to transformer H and T as described in connection with Fig. 1. The

contact 16. Current then flows from battery Q, over wire 31, circuit controller 17 operated by signal S, wire 32, front contact 12 of relay P Wire 33, front contact 11 of relay P wire 34, contact 16, Wire magnet M, and Wires 36, 23 andv 24 back to battery Current supplied over this circuit energizes magnet M and lifts dog 38 out of engagement with segment 37. The operator may then move lever U to its reverse position, thereby closing contact 4:0. The magnet M becomes de-energized as soon. as contact 16 is released. When contact 40 closes, current flows from battery Q, over wires 18 and 3!), reverse contact 40 of lever U, wire 41, front contact 13 of relay R wire 42, operating mechanism of signal S and Wires 43 and 2- bacl; to bat tery Q, Signal S then displays a proceed indication.

It should be pointed out that an aui-ziliary circuit provided for supplying energy to the code transmitter K over back contact 3 of rel ay R The purpose of this arrangement is to set the code transmitter 1: into operation when a train enters section A -l3 even though lever U is not moved away from its normal position in an attempt to cl signal S ll: will be manifest from the is n that the lever U can be moved to rev po it' for clearing S only if the tract. loop L is l interrupted cur" so that relay P and P are both o If the operator wishes to restore F gnal Q to the stop position, he moves lover U away from its reve se p" ion, until the lever is arrested by men 37 and. dog 3-3. thereliv interrupting the circuit for signal S and remeans for energizing said lock it and ditions rela Twill be ener ized and if sec-' tion AB is unoccupied so that relay R is energized, the code transmitter K will be stopped and the supply of periodically interrupted current 'tothe trackway loop L will be discontinued.

Although I have herein shown and described only two forms or" traclrwa apparatus embodying my invention, it is understood that various changes and modifications may be made therein withinthe scope of the appended claims without departing from the spirit and scope of my invention.

Having thus described my invention, what Iclaimis:

1. ;Trackway apparatus for an automatic train controlsystem comprising a trackway loop located at the entrance to train control territory and adapted when energized to cut the: train carried portion of the system into service, a signal governingthe entrance of trains into said territory, a lever for controlling said signal, and means for controlling said lever by current flowing in said loop.

QrTrackWay apparatus for an automatic train control system comprising a trackway loop located atthe entrance to train control territoryand adapted when energized to cut the train carried portion of the system into service, a signal overning the entrance'o'f trains into said territory, a lever for controlling said signal, an electric lock for preventing said lever from' being moved to clear the signal unless the lock is energized, and only it said loop is energized. Trackway apparatus for an automatic train control system comprising a trackway loop located at the entranceto automatic train control territory and adapted when on ergized to cut the train carried portion of the system into service, a relay'arrangedjto be energized when and only when said loop is energized, a signal governing the entrance of trains into said territory, a lever for controlling said signal, and means for cont-rolling said lever by said relay. V

4. Trackway apparatus for an automatic train control system, comprising a trackway loop located at the entrance to automatic train control territory and adapted when energized to cut the train carried portion of the system into service, a transformer having a primary included in circuit with said loop, a relay receiving energy from the secondary of said transformer, a signal governing the entrance of trains into said territory, a lever for con trolling said signal, an electric lock for preventing said lever from being moved to clear the signal unless the lock is energized, and means for energizing said lock it and only if said relay is energized.

5. Trackway apparatus for an automatic train control system comprising a trackwa-y loop located at the entrance to automatic train control territory and adapted when supplied with periodically interrupted alternating current to cut the train carried portion of the system into service, a slow releasing relay arranged to remain continuously closed while said loop is supplied with periodically interrupted current, a signal governing :the entrance of trains into said automatic train control territory, and means for controlling said signal by said relay.

6. T'rackway apparatus for an automatic train control system comprising a trackway loop located at the entrance to automatic train control territory and adapted when supplied with periodically interrupted alternating current to out the train carried portion of the system into service, a slow releasing relay arranged to remain continuously closed .while said loopjis supplied with periodically interrupted current, a signal governing the entrance of trains into said automatic train control territory, a lever for controlling said signal, and means for controllingsaid lever I by said relay '7. Trackway apparatus for an automatic train control system comprising a trackway loop located at'the entrance to automatic.

train control territory and adapted when supplied with periodically interrupted alternating current 'to cut the train car ried portion of the system into service, a

slowreleasing relay arranged to remain continuously closed while said loop is supplied withperiodically interrupted current, a signal governing the entrance of trains into said automatic train control territory, a lever for controlling'said signal, an electric lock for preventing said lever from being moved to clear the signal unless the lock is energized,

and means for energizing said-lock if and only if said relay is energized.

8- Trackway apparatus for an automatic train control system comprising a trackway loop located at the entrance to train control territory and adapted when supplied with periodically interrupted alternating current to cut the train carried portion of the system into service, an auxiliary circuit, a code transmitter having a front contact which is periodically closed while the transmitter is in operation and a back contact which is closed each time the front contact is open, means including said front contact for supplying alternating current to said loop, means includingsaid back contact for supplying alternati'ng'current to said auxiliary circuit, two slow releasing relays one reill ceiving energy from said loop and the other from said auxiliary circuit and each arranged to remain closed while said code transmitter is in operation, a signal governing the entrance of trains into said train control territory, and means for controlling said signal by said relays.

9. Trackway apparatus for an automatic train control system comprising a trackway loop located at the entrance to train control territory and adapted'when supplied with periodically interrupted alternating current to cut the train carried portion of the system into service, an auxiliary circuit, a code transmitter having a front contact which is periodically closed while the transmitter is in operation and a back contact which is closed each time the front contact is open, means including said front contact for supplying alternating current to said loop, means including said back contact for supplying alternating current to said auxiliary circuit, a first rectifier receiving current from said loop, a second rectifier receiving current from said auxiliary circuit, two slow releasing direct current relays receiving current from said first and second rectifiers respectively, a signal governing the entrance of trains into said train control territory, and means for controlling said signal by said relays.

10. Trackway apparatus for an automatic train control system comprising a trackway loop located at the entrance to train control territoryv and adapted when supplied with periodically interrupted alternating current to cut the train carried portion of the system into service, an auxiliary circuit, a code transmitter having a front contact which is periodically closed while the transmitter is in operation and a back contact which is closed each time the front contact is open, means including said front contact for supplying alternating current to said loop, means including said back contact for supplying alternating current to said auxiliary circuit, two slow releasing relays one receiving energy from said loop and the other from said auxiliary circuit and each arranged to remain closed while said code transmitter is in operation, a signal governing the entrance of trains into said train control territory, and means for preventing said signal being changed from the stop indication to a proceed indication unless both of said relays are closed.

11. Trackway apparatus for an automatic train control system comprising a trackway loop located at the entrance to train control territory and adapted when supplied with periodically interrupt-ed alternating current to cut the train carried portion ofthe system into service, an auxiliary circuit, a code transmitter having a front contact which is periodically closed while the transmitter is in opclosed while said code transmitter is in operation, a signal governing the entrance of trains into said train control territory, a lever for controlling said signal, an electric lock for preventing said lever being moved to clear the signal unless the lock is energized,

and means for energizing said lock if and only if both of said relays are closed.

12. Trackway apparatus for an automatic train control system comprising a trackway loop located at the entrance to train control territory and adapted when supplied with periodically interrupted alternating current to cut the train carried portion of the system into service, an auxiliary circuit, a code transmitter having a front contact which is periodically closed while the transmitter is in operation and a back contact which is closed each time the front contact is open, means including said front contact for supplying alternating current to said loop, means including said back contact for supplying alternating current to said auxiliary circuit, two slow releasing relays one receiving energy from said loop and the other from said aux iliary circuit and each arranged to remain closed while said code transmitter is in operation, a signal governing the entrance of trains into said train control territory, a lever for controlling said signal, an electric lock for preventing said lever being moved far enough from the stop position to clear the signal, unless the lock is energized, means for setting said code transmitter into operation upon a preliminary movement of said lever away from the stop position, and means for energizing said lock if and only if both of said relay are closed.

13. Trackway apparatus for an automatic train control system comprising a trackway loop located at the entrance to train control territory and adapted when supplied with periodically interrupted alternating current to cut the traincarried portion of the system into service, a code transmitter for supplying periodically interrupted current to said loop, a first slow releasing relay energized when. such current is being supplied to said loop, a second slow releasing relay energized while said current is interrupted, and a signal governing the entrance of trains into said train control territory and controlled by said two relays.

1 L. Trackway apparatus for an automatic train control system comprising a trackway loop located at the entrance to train control territory and adapted when supplied with periodically interrupted alternating current to cut the train carried portion of the system into service, an auxiliary circuit, a code transmitter having a front contact which is periodically closed while the transmitter is in operation and a back contact which is closed each time the front contact is open, means includingsaid front contact for supplying alternating current to said loop, means including said back contact for supplying alternating current to said auxiliary circuit, two slow releasing relays one receiving energy from said loop and the other from said auxiliary circuit and each arranged to remain closed while said code transmitter is in operation, a signal governing the entrance of trains into said train control territory and controlled by said relays and by traific conditions.

In testimony whereof I afiix my signature.

GEORGE W. BAUGHMAN. 

